[jira] [Updated] (DERBY-4480) "No suitable driver found" when attempting to connect while other thread is auto-loading the driver

["Knut Anders Hatlen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DERBY-4480?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Knut Anders Hatlen updated DERBY-4480:
--------------------------------------

    Attachment: testcase.diff

The attached patch adds a test case that verifies that concurrent autoloading of the Derby engine isn't a problem on Java 7 and newer.

I intend to close this issue as invalid once the test case has been checked in.
                
> "No suitable driver found" when attempting to connect while other thread is auto-loading the driver
> ---------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-4480
>                 URL: https://issues.apache.org/jira/browse/DERBY-4480
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC
>    Affects Versions: 10.2.1.6, 10.2.2.0, 10.3.1.4, 10.3.2.1, 10.3.3.0, 10.4.1.3, 10.4.2.0, 10.5.1.1, 10.5.2.0, 10.5.3.0, 10.6.1.0
>         Environment: OpenSolaris snv_129, X86
> Java(TM) SE Runtime Environment (build 1.6.0_17-b04)
> Java(TM) SE Runtime Environment (build 1.7.0-ea-b76)
>            Reporter: Knut Anders Hatlen
>              Labels: derby_triage10_8
>         Attachments: AutoloadTest.java, testcase.diff
>
>
> If you try to connect to embedded Derby from two threads simultaneously, and the embedded driver has not been loaded yet, one of the threads will trigger auto-loading of the driver and connect successfully, whereas the other thread will fail with this message: java.sql.SQLException: No suitable driver found for jdbc:derby:db;create=true
> This problem has been present since JDBC 4 auto-loading was implemented (10.2.1.6).

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